JP2008262996A - 半導体装置の製造方法及び半導体装置 - Google Patents
半導体装置の製造方法及び半導体装置 Download PDFInfo
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Abstract
【解決手段】直鎖構造のC5F8ガスを用いてCF膜を成膜し、その表面にハードマスクになる金属を直接形成する。このCF膜は、耐熱性が大きいので金属膜の膜剥れがなく、また機械的強度が大きいのでCMP加工にも耐えられ、またCMP加工の後処理を有機酸などで行うことによりCF膜の損傷もなくなる。その結果下層側のCF膜と上層側のCF膜との間にSiCNなどからなる比誘電率の高いキャップ膜が存在しなくなる。
【選択図】図1
Description
炭素及びフッ素を含む処理ガスをプラズマ化し、そのプラズマにより基板上にフッ素添加カーボン膜からなる層間絶縁膜を成膜する工程(a)と、
前記層間絶縁膜の表面に金属膜を成膜する工程(b)と、
前記金属膜をパターンに応じてエッチングすることにより当該金属膜からなるハードマスクを形成する工程(c)と、
前記ハードマスクを用いて前記フッ素添加カーボン膜をエッチングすることにより当該フッ素添加カーボン膜に凹部を形成する工程(d)と、
次いで、前記基板の表面に配線材料を成膜して前記凹部内に当該配線材料を埋め込む工程(e)と、
前記フッ素添加カーボン膜上の余剰の配線材料及び前記ハードマスクを除去してフッ素添加カーボン膜の表面を露出させる工程(f)と、
この工程により配線材料の表面に生成された酸化物を除去する工程(g)と、
を備えたことを特徴とする。
前記金属膜を成膜する工程(b)は、前記層間絶縁膜の上に直接金属膜を成膜する工程であることが好ましい。
炭素及びフッ素を含む処理ガスは、直鎖構造のC5F8 ガスであることが好ましく、更に三重結合を備えていることが好ましい。
前記金属膜の材質は、Ti、Ta、W及びAlから選ばれるものであることが好ましい。
前記ハードマスクの上に犠牲膜を形成し、この犠牲膜をマスクとして用いてフッ素添加カーボン膜をエッチングすることにより当該フッ素添加カーボン膜に凹部を形成する工程を行うようにしても良い。
前記フッ素添加カーボン膜の表面を露出させる工程(f)は、前記配線材料の表面を研磨する工程であっても良い。
前記酸化物を除去する工程(g)は、有機酸の液体または蒸気を基板の表面に供給する工程であるか、あるいは還元性ガス雰囲気下にて基板をアニールする工程であることが好ましい。
フッ素添加カーボン膜からなる層間絶縁膜とこの層間絶縁膜内に埋め込まれた配線材料とを含む下段側の回路層と、
前記配線材料の拡散を防止するために前記下段側の回路層の上に形成されたバリア層と、
このバリア層の上に直接形成されたフッ素添加カーボン膜からなる層間絶縁膜とこの層間絶縁膜内に埋め込まれた配線材料とを含む上段側の回路層と、を備えたことを特徴とする。
既述のキャップ層としてシリコン系化合物例えばSiCN膜が層間絶縁膜の一部として残っていた場合に、このSiCN膜が層間絶縁膜の比誘電率に与える影響を調べるために、以下の実験を行った。実験は、膜厚20nmのSiCN膜によりCF膜を上下に挟んだ積層体を形成し、CF膜の膜厚を100nm〜375nmまで25nm刻みで変えて、積層体の比誘電率を水銀プローブにより測定することにより行った。
(実験結果)
この結果を図6に示す。CF膜の膜厚が薄くなる程、全体の比誘電率が増加していくことが分かった。従って、上下のCF膜の間にキャップ膜が介在していると、デバイスの薄膜化が進むにつれて、層間絶縁膜の比誘電率の上昇が顕著になり、無視できなくなることが分かる。
(実験例2−1)
上記の成膜装置10を用いて、原料ガスとして直鎖構造のC5F8ガスにより、ウェハ上にCF膜を成膜し、更にその上にスパッタ法によりTi膜を成膜した。その後、真空雰囲気において400℃の熱処理を60分間行った。
(比較例2−1)
実験例2−1と同様に、CF膜を成膜した。尚、原料ガスとしては、環状構造のC5F8ガスを用いた。その後、このCF膜上にTi膜を成膜した。
(比較例2−2)
比較例2−1と同様にCF膜を成膜した。また、その後CF膜上にTa膜を成膜して、真空雰囲気において350℃にて30分間熱処理を行った。
(実験結果)
実験例2−1では、Ti膜の膜剥がれ、Ti膜とCF膜との間における気泡の発生などが見られず、ウェハ全面に亘って均一な色合いとなっており、良好な成膜状態であった。一方、比較例2−1では、Ti膜を成膜した状態で既に膜剥がれが生じていた。また、比較例2−2では、Ta膜の成膜後には問題がなかったものの、アニール後にはウェハWの至る場所において膜剥がれが生じていた。この比較例2−1、2−2間の差異は、TaとTiとの反応性の違いによるものだと考えられる。
成膜装置10を用いて、ウェハ上に直鎖構造のC5F8ガスによりCF膜を成膜し、次いでスパッタ法により、Ti膜、Ta膜及びCu膜をそれぞれ3nm、7nm、15nmとなるように成膜し、400℃の熱処理を60分間行った。その後、ウェハWの切断面をTEMにより撮影した。その結果を図7に示す。その結果、各々の膜間において膜剥がれや各膜間における元素の拡散といった変質などが起こっていなかった。従って、CF膜は、耐熱性が大きく、Ti膜などの金属膜をその表面に直接成膜しても問題ないことが分かる。
70 CF膜
71 金属膜
72 犠牲膜
73 パターン
74 フォトレジストマスク
75 犠牲膜
76 パターン
77 フォトレジストマスク
78 バリア膜
79 配線
79a 酸化層
80 溝
81 ビアホール
82 凹部
83 バリア膜
Claims (10)
- 炭素及びフッ素を含む処理ガスをプラズマ化し、そのプラズマにより基板上にフッ素添加カーボン膜からなる層間絶縁膜を成膜する工程(a)と、
前記層間絶縁膜の表面に金属膜を成膜する工程(b)と、
前記金属膜をパターンに応じてエッチングすることにより当該金属膜からなるハードマスクを形成する工程(c)と、
前記ハードマスクを用いて前記フッ素添加カーボン膜をエッチングすることにより当該フッ素添加カーボン膜に凹部を形成する工程(d)と、
次いで、前記基板の表面に配線材料を成膜して前記凹部内に当該配線材料を埋め込む工程(e)と、
前記フッ素添加カーボン膜上の余剰の配線材料及び前記ハードマスクを除去してフッ素添加カーボン膜の表面を露出させる工程(f)と、
この工程により配線材料の表面に生成された酸化物を除去する工程(g)と、
を備えたことを特徴とする半導体装置の製造方法。 - 前記金属膜を成膜する工程(b)は、前記層間絶縁膜の上に直接金属膜を成膜する工程であることを特徴とする請求項1に記載の半導体装置の製造方法。
- 炭素及びフッ素を含む処理ガスは、直鎖構造のC5F8 ガスであることを特徴とする請求項1または2に記載の半導体装置の製造方法。
- 前記直鎖構造のC5F8 ガスは、三重結合を備えていることを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記金属膜の材質は、Ti、Ta、W及びAlから選ばれるものであることを特徴とする請求項1ないし4のいずれか一つに記載の半導体装置の製造方法。
- 前記ハードマスクの上に犠牲膜を形成し、この犠牲膜をマスクとして用いてフッ素添加カーボン膜をエッチングすることにより当該フッ素添加カーボン膜に凹部を形成する工程を含むことを特徴とする請求項1ないし5のいずれか一つに記載の半導体装置の製造方法。
- 前記フッ素添加カーボン膜の表面を露出させる工程(f)は、前記配線材料の表面を研磨する工程である請求項1ないし6のいずれか一つに記載の半導体装置の製造方法。
- 前記酸化物を除去する工程(g)は、有機酸の液体または蒸気を基板の表面に供給する工程であることを特徴とする請求項1ないし7のいずれか一つに記載の半導体装置の製造方法。
- 前記酸化物を除去する工程(g)は、還元性ガス雰囲気下にて基板をアニールする工程であることを特徴とする請求項1ないし8のいずれか一つに記載の半導体装置の製造方法。
- フッ素添加カーボン膜からなる層間絶縁膜とこの層間絶縁膜内に埋め込まれた配線材料とを含む下段側の回路層と、
前記配線材料の拡散を防止するために前記下段側の回路層の上に形成されたバリア層と、
このバリア層の上に直接形成されたフッ素添加カーボン膜からなる層間絶縁膜と、この層間絶縁膜内に埋め込まれた配線材料とを含む上段側の回路層と、を備えたことを特徴とする半導体装置。
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US8124523B2 (en) | 2012-02-28 |
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US20100025856A1 (en) | 2010-02-04 |
CN101647110A (zh) | 2010-02-10 |
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